EP3379669A1 - Stromunterbrechungsgerät, das eine flüssigkristallanzeige und einen druckmechanismus umfasst - Google Patents

Stromunterbrechungsgerät, das eine flüssigkristallanzeige und einen druckmechanismus umfasst Download PDF

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Publication number
EP3379669A1
EP3379669A1 EP18151566.9A EP18151566A EP3379669A1 EP 3379669 A1 EP3379669 A1 EP 3379669A1 EP 18151566 A EP18151566 A EP 18151566A EP 3379669 A1 EP3379669 A1 EP 3379669A1
Authority
EP
European Patent Office
Prior art keywords
display
power cut
current
electrical
roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18151566.9A
Other languages
English (en)
French (fr)
Other versions
EP3379669B1 (de
Inventor
Carine Glas
François Vincent
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Electric Industries SAS
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Schneider Electric Industries SAS
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Publication date
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Publication of EP3379669A1 publication Critical patent/EP3379669A1/de
Application granted granted Critical
Publication of EP3379669B1 publication Critical patent/EP3379669B1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/18—Distinguishing marks on switches, e.g. for indicating switch location in the dark; Adaptation of switches to receive distinguishing marks
    • H01H9/181—Distinguishing marks on switches, e.g. for indicating switch location in the dark; Adaptation of switches to receive distinguishing marks using a programmable display, e.g. LED or LCD
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/02—Details
    • H01H21/025—Light-emitting indicators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/04—Levers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/04—Means for indicating condition of the switching device
    • H01H2071/042—Means for indicating condition of the switching device with different indications for different conditions, e.g. contact position, overload, short circuit or earth leakage

Definitions

  • Electrical power cutoff devices such as circuit breakers, contactors or switches very frequently include a display means such as a liquid crystal display.
  • a display means such as a liquid crystal display.
  • This means makes it possible to display to the user information on parameter values measured by the apparatus, for example current intensity values, the state of the apparatus, or the reason for a maneuver performed. by the device.
  • This display means is particularly useful when the switching device has proceeded to the opening of the electrical circuit automatically.
  • a circuit breaker can control an opening of its contacts in the event of a short circuit in the electrical installation. The same circuit breaker can also control an opening of its contacts in case of overload of the electrical installation.
  • the type of intervention requested from the user is different depending on whether there has been a short circuit or an overload: in the event of a short circuit, the user must search for the origin of the short circuit and repair the installation, whereas in the case of a overload, the user must simply unload the installation by stopping the operation of one or more electrical equipment.
  • the display on the display means of the cause of the opening of the contacts, short circuit or overload clearly informs the user on the origin of the fault.
  • a power cut-off device is very often de-energized, in particular when a protection device, located upstream in the electrical installation, has detected the fault and has opened the electrical circuit at his level. In this case, the power failure device is unable to supply a display means to indicate the origin of the fault.
  • the object of the invention is a power failure device comprising a display device for maintaining the information displayed at the time of the power failure and allowing a reset of the information displayed before a power-up, without input of auxiliary electrical energy.
  • the figure 1 represents a functional block diagram of a power cut-off device 1.
  • a cut-off device can be a circuit breaker intended to protect a part of an electrical installation against an electrical fault such as a short-circuit, a contactor for controlling the power supply of a receiver or a switch for opening or closing all or part of an electrical installation.
  • a power cut-off device 1 comprises at least one current line 10.
  • Two current lines 10 are represented in FIG. figure 1 , corresponding to a single-phase electrical installation. In a three-phase industrial electrical installation, there are three current lines corresponding to the three phases, or four lines of current when a neutral line is distributed with the three phases. The flow of current is established or cut by the switching device 1 by means of electrical contacts 11.
  • the switching device comprises a display module 20.
  • Said display module 20 comprises a bistable display 21.
  • a bistable display is a display that maintains the displayed information on one of its faces, called viewing face, after cutting off its power supply.
  • the information displayed can be one or more digits, alphanumeric characters or symbols.
  • Such a bistable display is preferably constituted by cholesteric liquid crystals.
  • the display on the bistable display 21 is controlled by a display control circuit 30.
  • the display control circuit 30 and connected to the bistable display 21 to control the display or extinction of all or part numbers, characters or symbols displayed on the display 21.
  • the display 21 is also controllable by pressure: the application of a pressure on the viewing face, for example by means of a mechanical device , causes a permanent orientation of the liquid crystal component of the display 21 in the same direction, the inscriptions that were displayed are erased.
  • the actuating lever 12 is connected to a pressing mechanism 22 by means of a rod 13.
  • the pressing mechanism 22 comprises a roller 23 driven by the rod 13, said roller 23 exerting a pressure on the display face of the display 21 in a phase of its displacement.
  • the figure 2 is a perspective view of the display module 20 and the pressing mechanism 22.
  • the pressing mechanism 22 has a wall 28 placed in a plane in a vertical direction V perpendicular to the display face of the display 21. The vertical direction is represented on the figure 2 by an arrow V.
  • the wall 28 comprises a groove 29 forming a predetermined contour 25.
  • the roller comprises an axis of rotation 24, one end of which is engaged in the groove 29.
  • the axis 24 of the roller 23 is guided in its movement by the groove 29 thus imposing a displacement of the axis and roller assembly along the contour 25.
  • FIG. figure 3A corresponding to a switching device 1 in a stable state, the actuating lever of the switch is in the low position, the contacts 11 being open.
  • the operator activates the lever 12 in the direction indicated by the arrow V.
  • the actuating lever actuates the closing of the contacts 11 and, by means of the connecting rod 13, activates the rolling of the roller 23 by following a first portion 26 of the contour 25.
  • the first portion 26 is parallel and vis-à-vis the display face of the display 21 corresponding to a measurement display area , status of the electrical device or symbol.
  • the figure 3B illustrates a second reference position showing the roller 23 substantially in the middle of the first portion 26.
  • the figure 3C illustrates a third reference position corresponding to the actuating lever in the high position, the contacts 11 are closed.
  • the switching device 1 can remain in this third position as long as an opening command of the contacts 11 is not activated. If the operator decides to open the contacts 11, he actuates the activation lever 12 in the opposite direction indicated by the arrow V.
  • the rod 13 drives the roller in a second portion 27 of the contour 25.
  • the 3D figure corresponds to a fourth reference position illustrating the passage of the roller substantially in the middle of the second portion 27.
  • the actuating lever is in position as illustrated in FIG. figure 3A .
  • a first distance D1 as the distance between the center of the axis 24 of the roller 23 and the display face of the display 21 when said roller 23 traverses the first portion 26.
  • the actuating lever of the switch is in the low position, the roller is located at a first end of the first portion 26 of the contour 25.
  • the operator raises the actuating lever in the vertical direction of bottom up as indicated by the arrow V.
  • the link 13 drives the roller 23 in the groove 29 along the first portion 26 of the path 25 in the direction indicated by the arrow V.
  • figure 3B shows the roller substantially in the middle of the first portion 26.
  • the first distance D1 is slightly smaller than the radius r of the roll 23 so that the roll 23 is in compression on the display face of the display 21.
  • the first distance D1 is equal to 4.5 millimeters
  • the radius r of the roll is equal to 5 millimeters.
  • the roll undergoes a compression equal to (r - D1) is 0.5 millimeters.
  • the first portion 26 being parallel to the display face of the display 21, the compression of the roll generates a pressure on the entire display face of the display 21 vis-à-vis the first portion 26
  • the display 21 is controllable by pressure, the circulation of the roll 23 in the first portion 26 causes an orientation of the liquid crystal component of the display 21 in the same direction, the inscriptions which were visible on the viewing face of the display 21 are erased.
  • the information displayed on the display 21 is reset in the closing phase of the contacts 11 of the switching device 1. This operation does not require electrical energy stored in a battery or taken by an auxiliary power supply. The only mechanical energy required to reset the device is sufficient.
  • the pressure exerted by the roller on the display face of the display 21 must be a calibrated pressure so as not to cause mechanical damage to the display 21 during the passage of the roller 23.
  • the calibrated pressure is between 100 grams / cm 2 and 500 grams / cm 2 .
  • the roller 23 is composed of a compressible material, for example rubber or a polymer in the form of high density foam. It may also consist of several layers of materials of different density, the outer layer being preferably composed of rubber or polymer. These materials are characterized by a stiffness K.
  • the calibrated pressure is adjusted either by adapting the first distance D1 to the stiffness K of the material used, this distance being able to be adjusted by a mechanical adjustment of the first distance D1, or by using a stiffness material K adapted.
  • An opening operation of the electrical contacts 11 is performed by an actuation of the actuating lever 12 in the opposite direction of the arrow V. During this operation, the data displayed by the display 21 must not be erased in order to keep any useful information relating to the cause of the opening of the contacts. For this, when the actuating lever 12 is actuated in the direction opposite to the arrow V, the axis of the roller 23 is guided by the groove 29 along the second portion 27 of the contour 25.
  • ratchets orient the axis of the roller towards the second portion 27 as soon as said roller circulates in the opposite direction of the arrow V.
  • Said second portion 27 is located at a second distance D2 from the display face of the display 21, said second distance D2 being greater than the first distance D1.
  • D2 is greater than the radius r of the roll 23.
  • the circulation of the roll 23 thus has a small impact on the opening operation contacts and in particular does not extend significantly the time required to open contacts.
  • the opening operation of the contacts 11 may be performed either by manual intervention of an operator, or automatically controlled by a fault detection device that actuates the actuating lever by means of a mechanism not shown.
  • the pressing mechanism 22 is connected to a mechanism for actuating the contacts 11 by means of the rod 13 to be activated by the movement of the contacts.
  • Many electric power cut-off devices 1 have magneto-thermal fault detection means consisting of electromechanical components that do not offer any indication to differentiate a trigger caused by an overload or by a short circuit.
  • the figure 4 represents a diagram of a set of circuits intended to display an exceeding of a fault current threshold cut by the breaking device 1.
  • At least one current sensor 31 measures a current flowing in a current line 10.
  • the current sensor 31 is connected to the measuring circuit 32 and provides a signal S representative of the current flowing in the current line 10.
  • Said measuring circuit 32 makes a measurement M of the current flowing in the current line 10.
  • the signal S is rectified and filtered by means of a rectifying diode DR1 and a capacitor C1.
  • the measuring circuit 32 is connected to the display control circuit 30.
  • the display control circuit 30 comprises a comparator 40 making a comparison between the measurement M and a predetermined threshold Sd.
  • the predetermined threshold Sd is between a measurement level M corresponding to an overload and a measurement level M corresponding to a short circuit.
  • Sd is between 120% and 300% of the nominal current of the breaking apparatus 1.
  • the measuring circuit 30 controls the display of a symbol on the 21, for example a symbol "CC" to indicate that the switchgear has measured a current greater than 300% of the rated current, which corresponds to a short circuit, before opening the contacts 11.
  • a symbol "CC” to indicate that the switchgear has measured a current greater than 300% of the rated current, which corresponds to a short circuit, before opening the contacts 11.
  • the measuring and display circuits 21 are arranged to give an indication of the maximum current flowing in the current line 10.
  • the current sensor 31 and the measuring circuit 32 have the function described above.
  • the display control circuit 30 comprises several comparators 41, 42, 43 respectively performing a comparison between the measurement M applied to their positive input and a predetermined threshold Smax1, Smax2 Smax3 applied to their negative input.
  • the thresholds Smax1, Smax2 Smax3 are realized by successive division of a voltage Vcc by means of resistors R1, R2, R3, R4 forming a resistive divider bridge referenced with respect to a reference potential Vss.
  • the adjustment of the value of the resistors R1, R2, R3, R4 defines the thresholds Smax1, Smax2 Smax3.
  • Smax1 is less than Smax2 and Smax2 is less than Smax3.
  • the output of each comparator 41, 42, 43 is connected to a display symbol of the display 21.
  • a first symbol is displayed on the display 21.
  • a second symbol is displayed on the display 21.
  • the threshold Smax2 being greater than the threshold Smax1 the first symbol remains displayed.
  • the display 21 is in the form of a stack of bars (in English "bargraph") represented in figure 5 .
  • a third symbol is displayed when the measure M exceeds the threshold Smax3. It is obvious that number of threshold is not limited and can be adapted to the need of the user. Thus the maximum amplitude reached by the current flowing in the current line 10 is stored on the display 21.
  • One or more sensors 31, a measuring circuit 32 and a display control circuit 30 can be made at low cost , in a minimal space that can be implanted in a magnetothermal electrical breaking device. An indicator for exceeding the threshold or maximum current the user valuable information to the diagnosis of a fault in the electrical installation.
  • at least one current sensor 31 is dedicated to the supply of energy for supplying the measurement circuits 32 and the display control circuit 30. The signal supplied by the current sensor is rectified and filtered in order to provide a rectified voltage. Continuous operable to supply the measurement circuits 32 and display control 30.
  • said measuring circuits 32 and display control 30 are low consumption circuits.
  • the display control circuit 30 includes a control input 33 for canceling the display of the measurement or the symbol displayed on the display 21, for example by means of the application of a voltage on the input control 33 to force the tilting of the comparators 41, 42, 43 to a state corresponding to an initial state upon power-up.
  • This function is intended to initialize the display without maneuvering the operating lever, for example in the context of testing the product on an industrial production line.

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  • Breakers (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
EP18151566.9A 2017-03-23 2018-01-15 Stromunterbrechungsgerät, das eine flüssigkristallanzeige und einen druckmechanismus umfasst Active EP3379669B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1752387A FR3064414B1 (fr) 2017-03-23 2017-03-23 Appareil de coupure de courant electrique comportant un afficheur a cristaux liquides et un mecanisme presseur

Publications (2)

Publication Number Publication Date
EP3379669A1 true EP3379669A1 (de) 2018-09-26
EP3379669B1 EP3379669B1 (de) 2019-03-13

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EP18151566.9A Active EP3379669B1 (de) 2017-03-23 2018-01-15 Stromunterbrechungsgerät, das eine flüssigkristallanzeige und einen druckmechanismus umfasst

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EP (1) EP3379669B1 (de)
FR (1) FR3064414B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11383685B2 (en) 2018-09-12 2022-07-12 Audi Ag Method for operating an assistance system of a motor vehicle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0226530A2 (de) * 1985-11-08 1987-06-24 Siemens Aktiengesellschaft Anzeigeeinrichtung für den Auslösestatus eines Niederspannungs-Leistungsschalters
US4969063A (en) * 1989-05-16 1990-11-06 Square D Company Circuit breaker with status indicating lights
FR2901912A1 (fr) * 2006-05-31 2007-12-07 Schneider Electric Ind Sas Dispositif de detection des trois etats d'un disjoncteur
DE102007022002A1 (de) * 2007-05-08 2008-11-13 Moeller Gmbh Anzeigeeinrichtung für ein Schaltgerät

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0226530A2 (de) * 1985-11-08 1987-06-24 Siemens Aktiengesellschaft Anzeigeeinrichtung für den Auslösestatus eines Niederspannungs-Leistungsschalters
US4969063A (en) * 1989-05-16 1990-11-06 Square D Company Circuit breaker with status indicating lights
FR2901912A1 (fr) * 2006-05-31 2007-12-07 Schneider Electric Ind Sas Dispositif de detection des trois etats d'un disjoncteur
DE102007022002A1 (de) * 2007-05-08 2008-11-13 Moeller Gmbh Anzeigeeinrichtung für ein Schaltgerät

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11383685B2 (en) 2018-09-12 2022-07-12 Audi Ag Method for operating an assistance system of a motor vehicle

Also Published As

Publication number Publication date
FR3064414A1 (fr) 2018-09-28
FR3064414B1 (fr) 2019-06-07
EP3379669B1 (de) 2019-03-13

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